Subwoofer Footing - Connect or Isolate?

High speed resonance transfer? Interesting indeed.

I know you can shorten the path with a product called Sound Coat. The net result is "heat"

BUT speed it up?

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It is obvious “oldhvymech”, you are a spring isolation advocate and that is OK, but when you produce challenges and/or statements based on your experiences, you can expect rebuttals, or a few questions directed back to you.

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At least your a gentleman/lady about the whole thing.. Kinda' rare on the forums these days..

I’m game, teach me if you would please.. :-)

With great respect and regard..

My subs, Martin Logan Depth i are designed to cancel internal vibrations. I do have them on Stillpoints SS Ultras which serve to couple and decouple. These made a noticeable positive difference

Any speaker enclosure is a pressurized passive radiator that outputs resonance in every direction. Best to direct couple the enclosure towards or to the floor because isolation at its best will only work in 1 direction. Tom

VMPS Bass system

The Passive Radiator (PR) located in the bottom of the cabinet already has a certain amount of mass attached to the center, by the factory. By adding or subtracting mass from the PR, it is possible to make system tonal balance warmer (higher Q) or tighter (lower Q). This is accomplished by changing an inert mass such as Mortite rope putty, the substance attached to the PR. You can buy additional putty at most hardware stores but your speaker is delivered over-damped (a bit too much putty), so that in almost all cases, you will tune the speakers by removing mass from the PR. Mass is accessible by inserting your hand into the slot formed by the base and the bottom of the cabinet. Removing a very small amount, no more than 1gram of putty, will be sufficient to make the adjustment.

Moving mass of PR is very low. Since a PR is driven equally over its entire surface by the active woofer's backwave, the diaphragm will move pistonically even if it is not rigid. The PR cones are treated paper. Paper is fine as long as you don't have to listen to their high frequency noise and distortion products. Facing the PR down and slot-loading it out the front filters such products out nicely.

We invented the slot-loaded PR and decided not to patent it, since we would spend our life in court defending against copies. We knew we were on the right track when we saw a Klipsch monitor at the AES in 1984 with a slot-loaded PR.

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1984, did you read that part, 1984...

You want to learn about BASS read this guys stuff. He was amazing..
Mr. DBA and Swarm offer some really great stuff too. BUT Cheney was the all time KING of great BASS without DSP or any digital correction..